Diff Bushing upgrade

asht · 12-14-2019, 11:59 PM

Quote:

Originally Posted by Spooler

I have the Z1 poly bushings and like them. No gear whine at all. My subframe however has solid NISMO bushings. I also have a modified Bellworks diff brace. I did get some noise from that.

Was it that good?
I was talking just about solid sub frame bushes. I had rose jointed suspension. Handled like it was a Kart, but the noise, was tough but loved it

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Rusty · 12-15-2019, 12:02 AM

Quote:

Originally Posted by asht

You need an Acetylene torch to cut the old
Bushes out. If you like refinement don’t do the Diff bushes. If you like the whine of a Hewland race box do it, because it grinds and whines like a rally car . I regret going solid bushes for a daily driver

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What are you trying to do with the torch? Burn the car down?

A 2" diameter deep hole saw will cut the old bushing out. Then use a sawzall to cut the outer shell in 2 places. Then knock it out with a muffler tool. Takes me about 3 minutes to remove the old bushing. I've done 3 bushings for other people so far.

I have the SPL solid diff bushing, the Bell diff brace and the SPL sub-frame bushings. I did the diff bushing first. Really, it wasn't that noisy. Even with the solid diff bushing, diff brace, and solid sub-frame bushings. It's not that noticeable.

Rusty · 12-15-2019, 12:07 AM

Quote:

Originally Posted by asht

Was it that good?
I was talking just about solid sub frame bushes. I had rose jointed suspension. Handled like it was a Kart, but the noise, was tough but loved it

Sent from my iPhone using Tapatalk

Every suspension bushing on my Z has been replaced with SPL spherical bearings. There is NO rubber in the suspension.

asht · 12-15-2019, 12:25 AM

Quote:

Originally Posted by Rusty

What are you trying to do with the torch? Burn the car down?

A 2" diameter deep hole saw will cut the old bushing out. Then use a sawzall to cut the outer shell in 2 places. Then knock it out with a muffler tool. Takes me about 3 minutes to remove the old bushing. I've done 3 bushings for other people so far.

I have the SPL solid diff bushing, the Bell diff brace and the SPL sub-frame bushings. I did the diff bushing first. Really, it wasn't that noisy. Even with the solid diff bushing, diff brace, and solid sub-frame bushings. It's not that noticeable.

No I took the subframe off first

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Rusty · 12-15-2019, 12:59 AM

Quote:

Originally Posted by asht

No I took the subframe off first

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Here's all of my install threads for the suspension.

The Complete SPL Front Suspension

The Complete SPL Rear Suspension (Almost)

Bell Raceworks Diff Brace Install

SPL Rear Sub-Frame Bushings

asht · 12-19-2019, 07:40 PM

Here was my S13 subframe. Solid bushes, poly bushes and Rose jointed suspension

It was noisy as hell but handled like a go kart

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Spooler · 12-19-2019, 07:44 PM

The only downside to it is going on and off throttle in traffic. 10mph There is no play so it is not very forgiving. It will buck some if you get the throttle and clutch input wrong. Been stuck in traffic many times.

optiontrader · 12-30-2019, 03:59 PM

I replaced my rear diff bushing since, as expected, the fluid-filled OEM bushing started leaking. My Z is stock (total DD), so I didn't have any noticeable increase is noise or vibration. The rear feels slightly more "planted" during take off and gear shifts, but it's very subtle.

If you have a transmission jack, it makes the replacement much easier. A multi-oscillating tool and sawzall is all that's needed to replace the original bushing. I went with Z1 in front, and Nolathane for the rear - and changed out the diff fluid in the process.

Have you replaced them out yet?

g96818 · 12-31-2019, 01:57 AM

I did poly subframe, diff bushing, Z1 Diff cover, bell raceworks diff brace, and poly trans mount when my diff bushing blew out half a year ago and I just installed all the rear SPL knuckle bushings and replaced all my suspension arms to voodoo13 and SPL endlinks.

It's so much easier drop the entire subframe and work on it on a table

Rusty · 12-31-2019, 06:10 PM

Quote:

Originally Posted by g96818

I did poly subframe, diff bushing, Z1 Diff cover, bell raceworks diff brace, and poly trans mount when my diff bushing blew out half a year ago and I just installed all the rear SPL knuckle bushings and replaced all my suspension arms to voodoo13 and SPL endlinks.

It's so much easier drop the entire subframe and work on it on a table

You got the Bell diff brace. What exhaust you have? How much clearance between the exhaust and brace?

g96818 · 01-01-2020, 02:58 AM

Quote:

Originally Posted by Rusty

You got the Bell diff brace. What exhaust you have? How much clearance between the exhaust and brace?

I have berk exhaust and no clearance issues. I saw your post with the FI clearance issues.

Tractionless · 01-03-2020, 02:45 PM

Quote:

Originally Posted by optiontrader

I replaced my rear diff bushing since, as expected, the fluid-filled OEM bushing started leaking. My Z is stock (total DD), so I didn't have any noticeable increase is noise or vibration. The rear feels slightly more "planted" during take off and gear shifts, but it's very subtle.

If you have a transmission jack, it makes the replacement much easier. A multi-oscillating tool and sawzall is all that's needed to replace the original bushing. I went with Z1 in front, and Nolathane for the rear - and changed out the diff fluid in the process.

Have you replaced them out yet?

Z1 solid front? What's Nolathane?

Frostydc4 · 01-04-2020, 01:21 AM

If your funds and/or S/O allows for it I would upgrade the subframe bushings while you are in there. The difference is night and day

g96818 · 01-04-2020, 03:29 AM

Quote:

Originally Posted by Tractionless

Z1 solid front? What's Nolathane?

Australian brand like whiteline, but cheaper

BOLIO 671 · 01-04-2020, 06:03 AM

Quote:

Originally Posted by g96818

I have berk exhaust and no clearance issues. I saw your post with the FI clearance issues.

So the Diff Brace clears with no issues with the Berk CBE? Any modifications needed for install? Was looking at getting this but read somewhere that it won’t clear the OEM or similar type of exhaust systems and it had only been proven to clear with the single exit Tomei

12-19-2019, 07:40 PM	#21 (permalink)
asht Enthusiast Member Join Date: Jul 2017 Location: Essex, UK Posts: 494 Drives: 2010 370z Roadster Rep Power: 117449	Here was my S13 subframe. Solid bushes, poly bushes and Rose jointed suspension It was noisy as hell but handled like a go kart Sent from my iPhone using Tapatalk Rusty, Optimiser, ZontheRocks and 1 others like this.

12-19-2019, 07:44 PM	#22 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,800 Drives: 2013 Nismo 370z Rep Power: 2684392	The only downside to it is going on and off throttle in traffic. 10mph There is no play so it is not very forgiving. It will buck some if you get the throttle and clutch input wrong. Been stuck in traffic many times. madwi and Optimiser like this.

12-30-2019, 03:59 PM	#23 (permalink)
optiontrader Track Member Join Date: Jul 2010 Location: Smog Hell, SoCal Posts: 595 Drives: 40th Rep Power: 16	I replaced my rear diff bushing since, as expected, the fluid-filled OEM bushing started leaking. My Z is stock (total DD), so I didn't have any noticeable increase is noise or vibration. The rear feels slightly more "planted" during take off and gear shifts, but it's very subtle. If you have a transmission jack, it makes the replacement much easier. A multi-oscillating tool and sawzall is all that's needed to replace the original bushing. I went with Z1 in front, and Nolathane for the rear - and changed out the diff fluid in the process. Have you replaced them out yet? __________________ 40th Anniversary Z - 3M Paint Protection Film, CA Legal Tint! (70/40)

12-31-2019, 01:57 AM	#24 (permalink)
g96818 Track Member Join Date: May 2009 Location: A rock in a big pond Posts: 681 Drives: 2009 370Z, 2012 M56 Rep Power: 3394	I did poly subframe, diff bushing, Z1 Diff cover, bell raceworks diff brace, and poly trans mount when my diff bushing blew out half a year ago and I just installed all the rear SPL knuckle bushings and replaced all my suspension arms to voodoo13 and SPL endlinks. It's so much easier drop the entire subframe and work on it on a table Rusty likes this. __________________ CZP are lying thieves!

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Frostydc4 Base Member Join Date: Dec 2017 Location: Scottsdale / Gilbert, A Posts: 8 Drives: 07' 350Z \| 12' 135i Rep Power: 7	If your funds and/or S/O allows for it I would upgrade the subframe bushings while you are in there. The difference is night and day